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Which SNR margin is which?

habile
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29 Jun 2009 09:03 #56509 by habile

Which SNR margin is which? was created by habile

Does anyone know which of the margins shown below is the one dictated by the MUX? I presume it's the ATU-C Info - Far SNR Margin?



Code:
> adsl status
  --------------------------- ATU-R Info (hw: annex A, f/w: annex A) -----------
   Running Mode            :    G.DMT       State                : SHOWTIME
   DS Actual Rate          :  7584000 bps   US Actual Rate       :   832000 bps
   DS Attainable Rate      :  7584000 bps   US Attainable Rate   :  1320000 bps
   DS Path Mode            :        Fast    US Path Mode         :        Fast
   NE Current Attenuation  :       10 dB    Cur SNR Margin       :       15  dB
   DS actual PSD           :    17. 9 dB    US actual PSD        :    12. 4   dB
   ADSL Firmware Version   : 211801_A
  -------------------------------- ATU-C Info ---------------------------------
   Far Current Attenuation :        5 dB    Far SNR Margin       :       18  dB
   CO ITU Version[0]       : 00005453       CO ITU Version[1]    : 00005443
   DSLAM CHIPSET VENDOR    : < TI >
>

Thanks,
Chris.

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lorian
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29 Jun 2009 20:19 #56520 by lorian

Replied by lorian on topic Which SNR margin is which?

Far SNR is for yout outbound data. You can't see the DSLAM/MSAN imposed SNR on that screen (or any other). you can find it out though, by rebooting, and it'll be the same as CUR SNR the moment showtime begins.

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habile
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30 Jun 2009 10:42 #56527 by habile

Replied by habile on topic Which SNR margin is which?

Lorian wrote: Far SNR is for yout outbound data. You can't see the DSLAM/MSAN imposed SNR on that screen (or any other). you can find it out though, by rebooting, and it'll be the same as CUR SNR the moment showtime begins.

Thanks Lorian! That'll be 15dB then

... no idea why on such a short line. Real shame you can't force margin on the Drayteks. I plugged a dLink in and forced SNRM to 6db and it gave me 8128 and stayed solid with no errors after 4/5 hours. The 2820 however still has increasing errors even with the lower sync speed

Shame really - this connection has been great for 3 years and the 2820 for 1 year of that.

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lorian
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30 Jun 2009 10:49 #56528 by lorian

Replied by lorian on topic Which SNR margin is which?

Whos's the ISP. If you are on max have you aked them to get BT to change it, they might if you NAG.

If you are on 21CN you can't get BT to change it, but it is much better at coming down on its own.

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habile
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30 Jun 2009 13:28 #56530 by habile

Replied by habile on topic Which SNR margin is which?

Lorian wrote: Whos's the ISP. If you are on max have you aked them to get BT to change it, they might if you NAG.

If you are on 21CN you can't get BT to change it, but it is much better at coming down on its own.

Entanet via ADSL24... they have been less than helpful

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